Mont. Code Ann. § 5-2-301

5-2-301 . Compensation and expenses for members while in session. (1) For the legislators serving in the legislative session beginning in January 2027, the salary of each legislator must be determined by multiplying 80% times the average hourly wage for the state of Montana, all industry types, posted by the United States bureau of labor statistics from the most recently published quarter of employment and wages data. For the legislators serving in the legislative session beginning in January 2029 and any subsequent biennium, the salary of each legislator must be determined to be equal to the average hourly wage for the state of Montana, all industry types, posted by the United States bureau of labor statistics from the most recently published quarter of employment and wages data. The average hourly rate must be calculated by dividing the average weekly wage by 40 hours. The president of the senate and the speaker of the house must receive an additional $5 a day in salary for those days during which the legislature is in session.

(2) Legislators may serve for no salary.

(3) Legislators are entitled to a daily allowance, 7 days a week, during a legislative session, as reimbursement for lodging, breakfast, lunch, dinner, and incidental expenses incurred in attending a session. The amount of the daily allowance is equal to the amount an employee of the executive branch of the federal government is generally entitled to receive as per diem for lodging, breakfast, lunch, dinner, and incidental expenses while away from home in the city of Helena but serving in the United States. Expense payments must stop when the legislature recesses for more than 3 days and resume when the legislature reconvenes.

(4) Legislators are entitled to a mileage allowance as provided in 2-18-503 for each mile of travel to the place of the holding of the session and to return to their place of residence at the conclusion of the session.

(5) In addition to the mileage allowance provided for in subsection (4), legislators, on submittal of an appropriate claim for mileage reimbursement to the legislative services division, are entitled to:

(a) three additional round trips to their place of residence during each regular session; and

(b) additional round trips as authorized by the legislature during special session.

(6) Legislators are not entitled to any additional mileage allowance under subsection (4) for a special session if it is convened within 7 days of a regular session.

(7) The department of administration shall work with the legislative services division to offer options to legislators to receive their session salary provided for in subsection (1) over the 2-year legislative term or a portion of the term. The options must be offered to all legislators in order to assist legislators to manage their income over the term. The per diem allowance and mileage as provided in this section, salary during a special session as provided in 5-3-101 , and the salary during the interim as provided for in 5-2-302 may not be affected.